<template>
  <!-- 所有的template都展示同一张图片,同一个文字 -->
  <div class='tab-bar-item' @click="itemClick">
    <div v-if='!isActive'>
      <slot name='item-icon'></slot>
    </div>
    <div v-else>
      <slot name='item-icon-active'></slot>
    </div>
    <div :style='activeStyle'>
      <slot name='item-text'></slot>
    </div>
  </div>
</template>

<script>
export default {
  name: 'TabBarItem',
  props: {
    path: String,
    activeColor: {
      type: String,
      default: 'red'
    }
  },
  data() {
    return {
      //isActive: true
    }
  },
  computed: {
    isActive() {
      // /home -> item1(/home) = true
      // /home -> item1(/category) = false
      // /home -> item1(/cart) = true
      // /home -> item1(/profile) = true
      return this.$route.path.indexOf(this.path) !== -1
    },
    activeStyle() {
      return this.isActive ? {color: this.activeColor} : {}
    }
  },
  methods: {
    itemClick() {
      this.$router.replace(this.path)
    }
  }
}
</script>

<style>
  .tab-bar-item {
    flex: 1;
    text-align: center;
    /*tab-bar一般高度49px*/
    height: 49px;
    font-size: 14px;
  }
  .tab-bar-item img {
    width: 24px;
    height: 24px;
    margin-top: 3px;
    vertical-align: middle;
    margin-bottom: 2px;
  }
  .active {
    color: red;
  }
</style>
